I have a friend - actually more an acquaintance - at university who has now twice failed and had to redo a year because all he does in his free time is play videogames. Hardly studies, hardly revises. He's a foreign student too so he's not covered by student loans, his parents are paying out of their own pockets for this.
Similarly, this year a housemate of mine ended up dropping out because he flunked his January exams. Why? Because the clearing in the woods was up till 5am every single night playing videogames.
That attitude just pisses me off. **** off if you're not going to try.